I recently built a new computer and I can't find any good drivers for my ATI 5970 was wondering if anyone knew of any. If anyone has suggestions for tuning as well I'm open to them. I've been going off of unigine heaven benchmark. I have CrossfireX enabled, though I'm not sure if heaven benchmark supports 4 GPUs, and I've managed to hit 70FPS with a score of 1667(I think) all settings at max once. Now I can't seem to pass 30FPS with all the drivers I've tried.

OS: Windows 7 64bit
Motherboard: MSI BigBang-xpower
CPU: Intel i7 x980 OC to 4.1GHz
GPU: two XFX Radeon 5970's no OC
RAM: Corsair 6GB clocked @1600MHz
Air cooled system, all temps are fine while playing games.